Renovation Planning in 2025: What You Need to Know Before Calling the Experts

Nadia Crighton
Aug 20
3 min read

Renovations remain one of the biggest trends in 2025 as more New Zealand homeowners look to improve both the value and functionality of their properties. Whether it’s upgrading a tired kitchen, modernising a bathroom, or opening up living spaces, a well-planned renovation can transform your home. But before you get started, it’s important to know how to plan your renovation properly and when it’s time to call in the professionals.

At Cowan Building, we understand the challenges and opportunities that come with home renovations. Here’s a practical guide to help you prepare.

Setting a Realistic Renovation Budget

Your budget is the foundation of any renovation project. Setting a clear, realistic figure from the beginning helps you make better choices and prevents costly surprises.

General budget guideline for New Zealand homeowners in 2025:

A renovation should typically cost between 5% and 15% of your property’s total value.
Always add a 15–20% buffer for unexpected expenses such as structural issues, supply chain delays, or hidden plumbing and electrical requirements.

Having a well-defined budget also allows your builder to recommend the best materials and solutions to maximise value without compromising on quality.

Key budget considerations include:

How much structural work will be required?
Will plumbing or electrical work be part of the renovation?
Are permits or council consents needed?
Could asbestos testing or removal be necessary?
Will you project manage yourself, or hire a professional team?
What is your timeline and deadline?
Have you accounted for appliances, fixtures, fittings, and materials?

DIY vs Hiring a Professional

The rise of DIY has inspired many homeowners, but in 2025 the risks remain the same: if you’re not experienced, attempting complex building work can cost more to fix in the long run.

Specialist trades: Plumbing and electrical work must be carried out by licensed professionals for compliance, safety, and insurance purposes.
Project management: Coordinating multiple trades requires expertise. One delay can disrupt the entire schedule, making professional oversight far more efficient.
Safe cost-cutting: Homeowners can still save money by handling simple tasks such as demolition, rubbish removal, or basic labouring — provided they have the time, ability, and confidence.

For most homeowners, engaging professionals ensures the job is completed correctly, safely, and within budget.

Choosing the Right Builder in 2025

Once your budget and vision are clear, it’s time to bring in the experts. Choosing the right builder is one of the most important steps in the renovation process.

Tips for selecting a renovation builder:

Research local contractors thoroughly.
Ask for referrals and follow up with past clients.
Review before-and-after photos of previous renovation projects.
Check independent reviews and testimonials.
Confirm experience specifically with renovations, as this differs from new builds.
Discuss communication processes, timelines, and transparency of costs.

The Bottom Line

Renovations can add significant value to your home and improve your lifestyle. The key to success in 2025 is careful planning, setting a realistic budget, and knowing when to call in professional builders. By following the right steps and choosing an experienced renovation specialist, you can achieve your dream home with less stress and greater confidence.

At Cowan Building, we provide expert renovation services across New Zealand, guiding homeowners through every stage of the process — from planning and budgeting to completion. With the right advice and professional support, your renovation project can be smooth, efficient, and rewarding.

Plan well, choose wisely, and enjoy the transformation.